David A. Smith
48Patents
15h-index
39Co-inventors
81Inventor score
Filing activity: Mar 31, 1975 → Jul 19, 2021
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5140727A | Zipper for reclosable thermoplastic bag, process and apparatus for making | Emerging Cross-Sectional Technologies | 137 | Expired |
| US5062603A | Vacuum drum purge method and apparatus | Performing Operations; Transporting | 104 | Expired |
| US5062549A | Hand held, dip-tube style liquid dispenser | Performing Operations; Transporting | 51 | Expired |
| US6550966B1 | Freezer storage bag | Emerging Cross-Sectional Technologies | 50 | Expired |
| US6371643B1 | Multi-Layered freezer storage bag | Performing Operations; Transporting | 48 | Expired |
| US5884424A | Roll-up sign | Physics | 46 | Expired |
| US4103445A | Roll-up sign | Physics | 42 | Expired |
| US4284301A | Bag transfer device | Performing Operations; Transporting | 40 | Expired |
| US4588070A | Bag transfer device | Performing Operations; Transporting | 31 | Expired |
| US5720128A | Landscape edging system | Human Necessities | 30 | Expired |
| US5428336A | Electric switches | Electricity | 21 | Expired |
| US5913955A | Vibration damping method and apparatus | Emerging Cross-Sectional Technologies | 21 | Expired |
| US4172597A | Magnetic pick-up device and marker | Human Necessities | 20 | Expired |
| US6860403B1 | Single pill dispenser | Performing Operations; Transporting | 18 | Expired |
| US6196244A | Configurable umbrella | Human Necessities | 17 | Expired |
| US6009652A | Sign construction | Physics | 14 | Expired |
| US4976673A | Apparatus and method for the production of flexible bags | Performing Operations; Transporting | 13 | Expired |
| US5074547A | Multiple delivery system | Performing Operations; Transporting | 13 | Expired |
| US4475867A | Axial fan and noise abatement apparatus combination | Mechanical Engineering; Lighting; Heating | 13 | Expired |
| US7997179B1 | Hybrid water cannon | Mechanical Engineering; Lighting; Heating | 12 | Active |
| US4169257A | Controlling the directivity of a circular array of acoustic sensors | Emerging Cross-Sectional Technologies | 12 | Expired |
| US5014978A | Method and apparatus for the sequential handling of flexible products | Performing Operations; Transporting | 10 | Expired |
| US4919415A | Multiple delivery system | Performing Operations; Transporting | 9 | Expired |
| US4959044A | Film tension compensation device for bag making machine | Performing Operations; Transporting | 9 | Expired |
| US5062825A | Apparatus and method for the production of flexible products | Performing Operations; Transporting | 8 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.